JPS61223508A - Radiation transmission type thickness meter - Google Patents

Abstract

PURPOSE:To make it possible to accurately obtain a measured value, by providing a detector for detecting radiation intensity between frame pieces through a high frequency attenuation type buffer apparatus. CONSTITUTION:A detector 12 is held by a buffer apparatus 13. The buffer apparatus 13 consists of vibration proof rubber 13a, a damper 13b and a spring 13c and vibration of several 100Hz is absorbed by the vibration proof rubber 13a and the vibration of a rolling machine is suppressed within a short time by the damper 13b and the spring 13c has function extremely reducing the transmission of vibration impact. Because the buffer apparatus 13 fixes the detector 12 at three points or more, said apparatus 13 can prevent not only the absorption of vibration impact in vertical and horizontal directions generated in the rolling machine but also the rotary motion of a radiation transmission type thickness meter. Therefore, even if the radiation transmission type thickness meter is arranged to the rolling machine, the accurate measurement of the thickness of a plate can be performed without receiving the effect due to vibration and impact.

Description

[Detailed Description of the Invention] (Industrial Application Field) The technical content described in this specification relates to the improvement of a radiographic thickness gauge used for plate thickness measurement. We propose the development results for obtaining a radiographic thickness gauge that can accurately measure plate thickness without being affected by the vibration shock generated by the rolling mill even when the gauge is attached to the plate. It's there.

(Prior art) The application of a radiographic thickness gauge to a plate rolling mill is to install a 0-type frame exclusively for the radiographic thickness gauge at a position of 10 m or more from the rolling mill, and to A radiographic thickness gauge was installed to eliminate the effects of vibration and shock generated by the rolling mill.

Radiographic thickness gauges can continuously measure the absolute thickness of hot-rolled materials, such as thick plates, over the entire length of the rolled material without contact, making it easy to reach the target thickness. Five GO control (Auto II lati) when modifying plate thickness etc.
o Gauge 0OntrO1) can be used for effective rolling.

However, as mentioned above, when measuring plate thickness at a location more than 10m away from the rolling mill, there is a significant time delay from when the material to be rolled leaves the rolling mill until it reaches the radiographic thickness gauge. It was not compatible with MuGO control.

On the other hand, as a prior art, Japanese Utility Model Application Publication No. 57-65709 discloses a mechanism for protecting the radiation thickness meter from the rolled material that breaks during rolling when measuring plate thickness using the radiation thickness meter (Xl! thickness meter). However, the detector of a radiographic thickness gauge in particular is an electronic circuit structure whose main parts are a scintillator and a photomultiplier tube, and its natural frequency is usually about 100 to 500B. , Vibration shock generated during rolling (60~600H
If affected by 2), it would resonate, making it impossible to measure the plate thickness accurately, and it would likely break down in a short period of time. Conventionally, radiographic thickness gauges were installed near the housing of the rolling mill. was not possible.

(Problems to be Solved by the Invention) As mentioned above, the problems of conventional radiographic thickness gauges used for plate thickness measurements have been solved, and plate thickness can be measured by installing a radiographic thickness gauge in a rolling mill. An object of the present invention is to obtain a radiographic thickness gauge that can accurately measure plate thickness without being affected by vibrations and shocks received from a rolling mill.

(Means for Solving the Problems) The present invention provides a radiation source container that stores a radiation source and a detector that detects radiation intensity between both housings on the operation side and the drive side of a rolling mill to prevent rolling material from being rolled. The detector for detecting the radiation intensity is a radiographic thickness gauge, which is attached to a pair of connecting frame pieces that sandwich the above and below the frame pieces, and the detector for detecting the radiation intensity is a radio-transmissive thickness gauge with a high-frequency attenuation type buffer device interposed between the frame pieces. In addition, the above-mentioned shock absorber has a vibration frequency component 6 unique to the rolling mill.
It is a high frequency damping type damping mechanism having sufficiently low resonance frequency characteristics of 5 OHZ or less for 0 to 600 H2.

#11v! J shows an example of the above-mentioned radiographic thickness gauge installed on a thick plate rolling mill, and 1 in the figure shows the material to be rolled,
g4gb is the housing on the operation side and drive side of the rolling mill, 3
a B b is the lowering screw, 4 is the upper backup rule, 5a51) is the upper backup field-k f H tsuk,
6 is upper work sale, 7 is lower backup 4-5a
sb is the lower backup 0-ruti lock, and 9 is the lower work roll. Also, ioa and b are rolling mill housing gag
These are connected pieces that sandwich the rolled material vertically over b2,
11 is a radiation source container, 12 is a detector 1, and 18 is a buffer device.

Here, even if a radiation transmission type thickness gauge is installed in a rolling mill to measure plate thickness, it is not affected by the vibration shock of the rolling mill. It is effective to hold the detector 12 at

2 and 8 show a buffer device 1 holding a detector 12.
8. As is clear from the side view shown in FIG. The damper 121t) has the function of absorbing the vibration of flZ, suppressing the vibration of the rolling mill within a short time, and the spring 18G extremely reducing the transmission of vibration shock.

Furthermore, as shown in the plan view of No. aF11, this shock absorber 18 is designed to fix the detector 12 at 8 or more points (in this example, 4 points are held), so that the vibration shock in the vertical and horizontal directions generated in one rolling mill is In addition to absorbing the amount of water, the structure also prevents rotational movement of the radiographic thickness gauge.

Therefore, even if a radiographic thickness gauge is installed in a rolling mill, vibrations and
Plate thickness can be measured accurately without being affected by impact.

The above-mentioned radiographic thickness gauge is used on the operating side of the rolling mill.
Although the housings 2a and 2b on the drive side were attached using the C1 connection frame pieces 1oa and b, it is also possible to hold them using existing equipment around this ground rolling mill, such as a stripper guide. Although the detector 12 was attached to the upper part of the connecting frame pieces 10a and 10b, and the radiation source container 11 was attached to the lower part of the connecting piece 1G&, there is no problem even if the installation positions are reversed.

(Example) Examples will be described below.

As shown in FIG. 1, a radiographic thickness gauge (using a 7.ii thickness gauge) according to the present invention was installed on a plate rolling mill (4-fold reversible type: backup roll φ2400X I$890).
1111% Work Stomach Rule φ1jiQQasX54901
11m) between the housings to prevent vibrations and shocks generated in the rolling mill housing. The vibrations and shocks received by the thickness gauge (detector held in a shock absorber) were measured.

The mounting position of the rflA thickness gauge is 1500 from the mill center.
(2) 1000all above the pass line (detector) and 400at below the pass line (II source).

Figure 4 (a) and (b) show the vibration data of the rolling mill connecting frame piece 1 (IL) in the vertical and horizontal directions and the vibration data of the detector 12 according to the present invention arranged vertically and compared. It is something.

The vibration/shock measured in the rolling mill connecting frame piece 10JL is 60 to 800 Hz 5 to 10 Gs in the vertical direction and 60 to 600 Hz 1 to 5 G in the horizontal direction, whereas the detector 12 according to the present invention 20-50 Hzs in direction
O, 5G or less, 18-28H1°0.5G in the horizontal direction
It was below.

FIG. 5 shows an example of natural vibration data of a photomultiplier tube, which is a typical electronic component incorporated into the detector 11.

Normally, the photomultiplier tube has a natural frequency near 4:aOH1, but if an I-line thickness gauge with the detector 12 fixed with a buffer device 18 is used, the vibration shock generated in the rolling mill can be sufficiently reduced. be able to.

Table 1 shows a comparison of the durability of the 711 thickness gauge.

Table 1 In the example, the case where the liI thickness gauge is attached to a thick plate rolling mill is described, but it is not limited to only a thick plate rolling mill. Also, a Xil thickness gauge may be attached instead of the 7M thickness gauge.

(Effects of the Invention) As described above, according to the present invention, even if a 7M thickness gauge is attached to a rolling mill to measure plate thickness, the influence of vibration and shock generated in the rolling mill can be reduced as much as possible, so accurate measurement values can be obtained. can be obtained. Furthermore, the present invention enables highly responsive mu GO control, and the desired plate thickness accuracy can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is an external view of the main parts of the plate rolling mill, Fig. 2 is a side view of the buffer device 18 that holds the detector 12, Fig. 8 is a plan view, and Fig. 4v! J is an oscilloscope waveform photograph showing measurement data of vibrations generated in the rolling mill housing. Figure 5 is a measurement date of the natural vibration of a photomultiplier tube...Rolled material 21L2b--Rolling on the operation side and drive side. machine housing a
aab--Downward screw 4...Upper backup roll 5asb...Upper backup roll chock 6
...Upper work roll 7...Lower backup roll 8a8b...Lower backup rule chock 9.
...Lower work field 10--Connected fragments 11...Radiation source container 11-...Detector 13...-Buffer device Fig. 1 Fig. 2 ψ Fig. 4 (a) (A horse chestnut in the υ1 direction 1 visit day (b) Horizontal force direction photographic data M wave number

Claims (1)

[Claims] 1. A radiation source container that stores a radiation source and a detector that detects radiation intensity are placed between the housings on the operating side and the driving side of the rolling mill, and the material to be rolled is held between the upper and lower sides. A radiographic thickness gauge is attached to a pair of connecting frame pieces, each of which has a detector for detecting radiation intensity, and a high-frequency attenuation type buffer device is interposed between the detector and the frame pieces. 2. The shock absorber absorbs the vibration frequency component 60 to 6, which is unique to the rolling mill.
The radiographic thickness gauge according to claim 1, comprising a high frequency attenuation type damping mechanism having a resonance frequency of 50 Hz or less, which is sufficiently low compared to 00 Hz.